Bridge



mm AM OP. OR 0 W M 0% I Fm .0 WM

(No Model.)

No. 415,174. Patented Nov". 12, 1889.

H: 1 q 4 v 5i 1 NITED STATES PATENT OFFICE.

TVILLIAM FITZ CHARLES MASON MOCARTY, OF HAGERSTOWN, MARYLAND,

ASSIGNOR OF PART TO VILLIAM H. ASHTON AND HEMAN DUDLEY WVAL- BRIDGE, BOTH OF XVASHINGTON, DISTRICT OF COLUMBIA.

MOLDI NG ARMOR-PLATES.

SPECIFICATION forming part of Letters Patent No. 415,174, dated November 12, 1889.

Application filed August 29, 1839: Serial No. 322,333. (No model.) I

To all whom it may concern: with, the sides of said plates being provided Be it known that I, WlLLIAM FITZ CHARLES withnumerous cavities 0, into which is placed a MASON MOCARTY, a citizen of the United fluxing and case-hardening compound, so that States, residing at Hagerstown, in the county as the plates melt away a permanent joint is 55 5 of \Vashington and State of Maryland, have formed and a plate is produced which is not invented new and useful Improvements in only homogeneous throughout, butcase-hard- Molding Armor-Plates; and I do hereby deened and composed of two or more metals havclare the following to be a full, clear, and exing different degrees of hardness, or a plate act description of said invention, reference composed of layers of iron and steel, as may 60 being had to the accompanying drawings, and be desired. The forming of the cavities in the to the letters of reference marked thereon, plates causes the plates to melt away quicker which form a part of this specification. at these points and allows the molten metal My invention relates to an improvement in in each compartment to mix and have intermolds for casting armor-plates for ships of locking joints, which also tend to hold the 65 I war, and has for its object the construction plates or sections forming the plates more of armor-plates composed of layers of steel or firmly together. This process not only simother metal of different degrees of hardness, plifies the manufacture of steel plates, ingots,

in order to more effectually resist the force of &c.,but the cost of producing them is reduced the shot projected against it. to the minimum. 70 My invention consists in the devices and The fluxing or cementing compound is filled molds for casting compound armor-plates of into the cavities in the plates G, and is comtwo or more strata of steel of diiferent hardposed of the following ingredients: yellow ness by placing division-plates in the molds prussiate of potash, one-fourth; cyanide of of fusible metal, said division-plates being potash, one-fourth; animal charcoal, one-half. 75 provided with cavities for the reception of a These ingredients are mixed intoapaste with flux and case-hardening compound. either glyccrine, glucose, or any other suit- Referring to the drawings, Figure 1 is a top able vehicle to form a paste, which is filled or plan view of the mold open. Fig. 2 is a into the cavities of the plates and well dried view in perspective of the mold when filled. to harden the flux in position. 80 Fig. 3 is also aviewinperspective of the mold, The molten masses of metal of which the showing the cavities in the division-plates. plates are formed are subjected to a vacuum Fig. 4: is an edge view of the division-plates. to remove all the occluded gases, so that a Fig. 5 is a view in perspective of one of the homogeneous, mass may be formed free from compound plates. blow-holes, gases, 850., thus producing a mo- 85 A indicates the mold in which the plates lecularstructuremoredense,andconsequently are cast, and is composed of the sides B, botstronger, than by any other process, this protom C, and end pieces I), the whole being cess of vacuum treatment being embraced in held and clamped in position by rods E and my patent, No. a04,723, of June 4,1889. end pieces F in the usual manner. The end Vhat I claim, and desire to secure by Leto sections D of the molds are provided with ters Patent, is

grooves a to receive and sustain in a vertical Amold for casting armor-plates, dividedinto position the diaphragms or plates G, and the sections by fusible plates provided with cavibottom of said mold is provided with openties containingaflux and case-hardening comings h, entering each compartment formed by pound. 95 4 5 the diaphragms, which communicate with suit- In testimony whereof I affix my signature in able fire-resisting pipes, and through which the presence of two subscribing witnesses. the molten metal is admitted to the different WILLIAM FHZ CHARLES MASON MGOARTY. compartments of the mold.

The diaphragms or division-plates G are lVitnesses: made of a suitable metal which will melt as GEORGE CAMPION,

the molten metal is brought in contact there- WM. LOGAN. 

